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id="post-info"><h1 class="post-title">零成本制作随机图片 API</h1><div id="post-meta"><div class="meta-firstline"><span class="post-meta-date"><i class="far fa-calendar-alt fa-fw post-meta-icon"></i><span class="post-meta-label">发表于</span><time class="post-meta-date-created" datetime="2020-07-31T06:22:12.000Z" title="发表于 2020-07-31 14:22:12">2020-07-31</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2021-08-14T04:39:34.443Z" title="更新于 2021-08-14 12:39:34">2021-08-14</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/%E6%9D%82%E6%96%87/">杂文</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span class="post-meta-pv-cv"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="busuanzi_value_page_pv"></span></span><span class="post-meta-separator">|</span><span class="post-meta-commentcount"><i class="far fa-comments fa-fw post-meta-icon"></i><span class="post-meta-label">评论数:</span><a href="/scribble/make_api/#post-comment"><span id="twikoo-count"></span></a></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><p>最近有小伙伴问我 <a target="_blank" rel="noopener" href="https://api.yunist.cn/">api.yunist.cn</a> 这个 API 是怎么做的, 其实非常简单, 用 <a target="_blank" rel="noopener" href="https://leancloud.cn/">LeanCloud</a> 的免费实例做的, 废话不多说, 开干!</p>
<h1 id="准备"><a href="#准备" class="headerlink" title="准备"></a>准备</h1><h2 id="创建账号及应用"><a href="#创建账号及应用" class="headerlink" title="创建账号及应用"></a>创建账号及应用</h2><p>先去 <a target="_blank" rel="noopener" href="https://leancloud.cn/">LeanCloud</a> 注册个账号 (建议使用国际版, 这样绑定域名的时候不需要备案, 域名已经备案了的请无视) . 然后去控制台创建一个应用, 选择开发版, 名字就叫 image-api 吧.</p>
<p><img src="1.png"></p>
<h2 id="下载命令行工具"><a href="#下载命令行工具" class="headerlink" title="下载命令行工具"></a>下载命令行工具</h2><p>详情请看<a target="_blank" rel="noopener" href="https://leancloud.cn/docs/leanengine_cli.html#hash1443149115">安装命令行工具</a>.</p>
<h2 id="登录并初始化项目"><a href="#登录并初始化项目" class="headerlink" title="登录并初始化项目"></a>登录并初始化项目</h2><p>命令行输入</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">lean login</span><br></pre></td></tr></table></figure>

<p>登录, 然后按照提示选择区域并输入 LeanCloud 用户名和密码完成登录.</p>
<p>然后随意创建一个新文件夹, 进入里面执行</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">lean init</span><br></pre></td></tr></table></figure>

<p>然后会输出大概类似下面的信息</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">[?] Please select an app: </span><br><span class="line"> 1) Valine-Admin</span><br><span class="line"> 2) image-api</span><br><span class="line"> =&gt; </span><br></pre></td></tr></table></figure>

<p>输入 <code>2</code> , 回车, 然后又会出现</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">[?] Please select a language</span><br><span class="line"> 1) Node.js</span><br><span class="line"> 2) Python</span><br><span class="line"> 3) Java</span><br><span class="line"> 4) PHP</span><br><span class="line"> 5) Others</span><br><span class="line"> =&gt; </span><br></pre></td></tr></table></figure>

<p>输入 <code>4</code> 回车, 然后…</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">[?] Please select an app template: </span><br><span class="line"> 1) Slim</span><br><span class="line"> =&gt;</span><br></pre></td></tr></table></figure>

<p>输入 <code>1</code> 回车, 项目就在本地初始化了.</p>
<h1 id="实现随机-API"><a href="#实现随机-API" class="headerlink" title="实现随机 API"></a>实现随机 API</h1><h2 id="代码"><a href="#代码" class="headerlink" title="代码"></a>代码</h2><p>进入 <code>public/index.php</code> , 然后就可以在这里写实现随机 API 的代码了. 至于如何写随机 API … 其实很简单, <del>百度一下就有了.</del></p>
<p>可以写成如下形式</p>
<figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;?php</span> </span><br><span class="line"><span class="variable">$num</span> = <span class="number">58</span>;</span><br><span class="line"><span class="variable">$url</span> = <span class="string">&#x27;&#x27;</span>;</span><br><span class="line"><span class="variable">$img</span> = file_get_contents(<span class="variable">$url</span>, <span class="literal">true</span>);</span><br><span class="line">header(<span class="string">&#x27;Content-Type: image/jpeg&#x27;</span>);</span><br><span class="line"><span class="keyword">echo</span> <span class="variable">$img</span>;</span><br><span class="line"><span class="keyword">exit</span>;</span><br><span class="line"><span class="meta">?&gt;</span></span><br></pre></td></tr></table></figure>

<p>其中 <code>$url</code> 变量需要你自己填写逻辑. 如果还是不会, 还是百度吧…. (Google 也可以哟)</p>
<h2 id="上传并部署"><a href="#上传并部署" class="headerlink" title="上传并部署"></a>上传并部署</h2><p>写完代码之后就是上传和部署了, 非常简单, 只需要</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">lean deploy --prod 1</span><br></pre></td></tr></table></figure>

<p>就好了.</p>
<h1 id="绑定域名"><a href="#绑定域名" class="headerlink" title="绑定域名"></a>绑定域名</h1><h2 id="绑定-LeanCloud-域名"><a href="#绑定-LeanCloud-域名" class="headerlink" title="绑定 LeanCloud 域名"></a>绑定 LeanCloud 域名</h2><p>如果你没有独立域名的话, 就只能绑定 LeanCloud 的二级域名. 进入应用 -&gt; 云引擎 -&gt; 设置 -&gt; 云引擎域名设置域名, 填写你想要的域名, 然后保存就可以了.</p>
<p><img src="2.png"></p>
<h2 id="绑定独立域名"><a href="#绑定独立域名" class="headerlink" title="绑定独立域名"></a>绑定独立域名</h2><p>绑定独立域名需要你拥有自己的域名. 点击 “绑定独立域名” , </p>
<p><img src="3.png"></p>
<p>然后在 “云引擎、ClientEngine 域名” 下点击 “绑定新域名”,</p>
<p><img src="4.png"></p>
<p>然后写上你想要绑定的域名, 点击确定. 根据它的提示去你域名 DNS 解析所在服务商进行 CNAME 解析. 绑定成功后, 会提示 “已绑定” .</p>
<h1 id="开始使用"><a href="#开始使用" class="headerlink" title="开始使用"></a>开始使用</h1><p>只要访问你绑定的域名就可以啦! 现在你就拥有了一个属于自己的 API , 是不是很简单呢. 不过 LeanCloud 免费实例是有休眠政策的.</p>
<blockquote>
<p>如果最近 24 小时内累计运行超过 18 小时，则强制休眠。此时新的请求会收到 503 的错误响应码</p>
</blockquote>
<p>所以… 如果想要无限制使用, 可以升级实例.</p>
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